It's a personality thing, to a fair extent and as already mentioned, someone who is confident, but possibly, in the opinion of others, " full of s**t "will often be more successfull, simply because they have the brass neck to ask for high prices.
This may make them " successfull " but not necessarily a credit to the industry as they are diving in, all gloss and glitter, but with little or no training, simply " taking the money " and leafleting huge geographical areas.
I fully appreciate the " business sense " of not being too cheap and would never advocate it ( I've been there ) but to get inexperienced and possibly incompetent people going into homes and charging some of the prices recorded on here can only do damage for the industry.
No matter what anyone says or thinks, society is being driven more and more by price awareness, which, as M & S has shown, can only be addressed, by marketing VALUE / QUALITY when they were previously regarded as EXPENSIVE.
The difference is..................M&S deliver what the promise !